The Relationship Between Parameters Of Frontal Ostium And Morphological Parameters Of The Agger Nasi Cell And The Severity Of Chronic Frontal Sinusitis

Objective To investigate the relationship between parameters of frontal ostium and morphological parameters of agger nasi cell and the severity of chronic frontal sinusitis,and to provide a basis for the anatomical pathogenesis of chronic sinusitis.Methods Retrospective analysis of 113 patients with chronic frontal sinusitis and25 normal individuals,were divided into 0,1,2,3 and 4 groups according to the soft tissue density rate of frontal sinus.The imported sinus CT data were processed by Mimics 21.0 3D reconstruction software,and used for three-dimensional reconstruction of frontal sinus and agger nasi cell,and relevant parameters were measured.Comparison of the volume,surface area,vertical diameter,anteroposterior diameter,and mediolateral dimension of the nasal nasi cell,FB value（Thickness of the frontal beak）,FI value（The shortest distance between the most prominent part of the frontal beak and the posterior wall of the frontal sinus in the sagittal images）,FR value（In the sagittal image,distance between the most prominent part of the frontal beak and the highest attachment point of the anterior wall of the ethmoid bulla at the base of the skull）,and FI cross-sectional area.The Kruskal-wallis test was used to analyze the relationship between parameters of frontal ostium and morphological parameters of agger nasi cell and the severity of chronic frontal sinusitis.Results 1.Morphological parameters of the agger nasi cell were not identical in the five groups of patients with different degrees of frontal sinus turbidity.The volume,surface area,and vertical diameter of the agger nasi cell of group 0 were lower than those of the other groups,and the differences were statistically significant（P<0.05）;the mediolateral dimension of the agger nasi cell of group 0 were lower than those of groups 1 and 3,and the differences were statistically significant（P<0.05）.2.The parameters of frontal ostium were not identical in the five groups of patients with different degrees of frontal sinus turbidity.The FI value of normal group 0 was higher than the rest of the groups,and the FI cross-sectional area of group 0 was higher than that of groups 2,3 and 4,with statistically significant differences（P<0.05）.The FI value and FI cross-sectional area of group 1 were higher than those of groups 3 and 4,with statistically significant differences（P<0.05）,and the FI cross-sectional area of group 2was higher than that of group 4,with statistically significant differences（P<0.05）.The higher the degree of frontal sinus turbidity,the smaller the FI and FI cross-sectional area compared with the normal 0 group.3.Spearman rank correlation analysis suggests that FI cross-sectional area was positively correlated with FI and FR values（r_s=0.606,r_s=0.213,P<0.05）and weakly negatively correlated with the volume,surface area and vertical diameter of the nasal nasi cell（r_s=-0.154,r_s=-0.161,r_s=-0.250,P<0.05）.The volume,surface area,vertical diameter,anteroposterior diameter,and mediolateral dimension of the nasal nasi cell,was weakly negatively correlated with FI（rs=-0.276,rs=-0.265,rs=-0.308,rs=-0.189,rs=-0.160,P<0.05）.Conclusion Morphological parameters of the agger nasi cell and FI value and FI cross-sectional area are involved in the occurrence and development of chronic frontal sinusitis,and are negatively correlated with the severity of chronic frontal sinusitis.